X11 forwarding subsystem - add plumbing to permit a temporary XAUTHORITY file
Build out sufficient plumbing such that a temporary XAUTHORITY file can be used that is local to the compute node, thus avoiding lock contention on ~/.Xauthority on parallel filesystems. This commit only includes the requisite plumbing to pass this around. If this is not used, a null string results, and the XAUTHORITY env var will not be forced into the user environment. Add support and fix the modified API call in pam_slurm_adopt while here. Bug 3647.
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